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Open Access Publications from the University of California

Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions.

  • Author(s): Acharya, S;
  • Adamová, D;
  • Adler, A;
  • Adolfsson, J;
  • Aggarwal, MM;
  • Aglieri Rinella, G;
  • Agnello, M;
  • Agrawal, N;
  • Ahammed, Z;
  • Ahmad, S;
  • Ahn, SU;
  • Akindinov, A;
  • Al-Turany, M;
  • Alam, SN;
  • Albuquerque, DSD;
  • Aleksandrov, D;
  • Alessandro, B;
  • Alfanda, HM;
  • Alfaro Molina, R;
  • Ali, B;
  • Ali, Y;
  • Alici, A;
  • Alkin, A;
  • Alme, J;
  • Alt, T;
  • Altenkamper, L;
  • Altsybeev, I;
  • Anaam, MN;
  • Andrei, C;
  • Andreou, D;
  • Andrews, HA;
  • Andronic, A;
  • Angeletti, M;
  • Anguelov, V;
  • Anson, C;
  • Antičić, T;
  • Antinori, F;
  • Antonioli, P;
  • Anwar, R;
  • Apadula, N;
  • Aphecetche, L;
  • Appelshäuser, H;
  • Arcelli, S;
  • Arnaldi, R;
  • Arratia, M;
  • Arsene, IC;
  • Arslandok, M;
  • Augustinus, A;
  • Averbeck, R;
  • Aziz, S;
  • Azmi, MD;
  • Badalà, A;
  • Baek, YW;
  • Bagnasco, S;
  • Bai, X;
  • Bailhache, R;
  • Bala, R;
  • Baldisseri, A;
  • Ball, M;
  • Balouza, S;
  • Barbera, R;
  • Barioglio, L;
  • Barnaföldi, GG;
  • Barnby, LS;
  • Barret, V;
  • Bartalini, P;
  • Barth, K;
  • Bartsch, E;
  • Baruffaldi, F;
  • Bastid, N;
  • Basu, S;
  • Batigne, G;
  • Batyunya, B;
  • Bauri, D;
  • Bazo Alba, JL;
  • Bearden, IG;
  • Bedda, C;
  • Behera, NK;
  • Belikov, I;
  • Bell Hechavarria, ADC;
  • Bellini, F;
  • Bellwied, R;
  • Belyaev, V;
  • Bencedi, G;
  • Beole, S;
  • Bercuci, A;
  • Berdnikov, Y;
  • Berenyi, D;
  • Bertens, RA;
  • Berzano, D;
  • Besoiu, MG;
  • Betev, L;
  • Bhasin, A;
  • Bhat, IR;
  • Bhat, MA;
  • Bhatt, H;
  • Bhattacharjee, B;
  • Bianchi, A;
  • Bianchi, L;
  • Bianchi, N;
  • Bielčík, J;
  • Bielčíková, J;
  • Bilandzic, A;
  • Biro, G;
  • Biswas, R;
  • Biswas, S;
  • Blair, JT;
  • Blau, D;
  • Blume, C;
  • Boca, G;
  • Bock, F;
  • Bogdanov, A;
  • Boi, S;
  • Boldizsár, L;
  • Bolozdynya, A;
  • Bombara, M;
  • Bonomi, G;
  • Borel, H;
  • Borissov, A;
  • Bossi, H;
  • Botta, E;
  • Bratrud, L;
  • Braun-Munzinger, P;
  • Bregant, M;
  • Broz, M;
  • Brucken, EJ;
  • Bruna, E;
  • Bruno, GE;
  • Buckland, MD;
  • Budnikov, D;
  • Buesching, H;
  • Bufalino, S;
  • Bugnon, O;
  • Buhler, P;
  • Buncic, P;
  • Buthelezi, Z;
  • Butt, JB;
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  • Ceballos Sanchez, C;
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  • Chang, W;
  • Chapeland, S;
  • Chartier, M;
  • Chattopadhyay, S;
  • Chattopadhyay, S;
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  • Cheshkov, C;
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  • Chibante Barroso, V;
  • Chinellato, DD;
  • Cho, S;
  • Chochula, P;
  • Chowdhury, T;
  • Christakoglou, P;
  • Christensen, CH;
  • Christiansen, P;
  • Chujo, T;
  • Cicalo, C;
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  • Collu, A;
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  • Conesa Balbastre, G;
  • Conesa Del Valle, Z;
  • Contin, G;
  • Contreras, JG;
  • Cormier, TM;
  • Corrales Morales, Y;
  • Cortese, P;
  • Cosentino, MR;
  • Costa, F;
  • Costanza, S;
  • Crochet, P;
  • Cuautle, E;
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  • Cunqueiro, L;
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  • Dahms, T;
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  • Damas, FPA;
  • Danisch, MC;
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Abstract

The first evidence of spin alignment of vector mesons (K^{*0} and ϕ) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element ρ_{00} is measured at midrapidity (|y|<0.5) in Pb-Pb collisions at a center-of-mass energy (sqrt[s_{NN}]) of 2.76 TeV with the ALICE detector. ρ_{00} values are found to be less than 1/3 (1/3 implies no spin alignment) at low transverse momentum (p_{T}<2  GeV/c) for K^{*0} and ϕ at a level of 3σ and 2σ, respectively. No significant spin alignment is observed for the K_{S}^{0} meson (spin=0) in Pb-Pb collisions and for the vector mesons in pp collisions. The measured spin alignment is unexpectedly large but qualitatively consistent with the expectation from models which attribute it to a polarization of quarks in the presence of angular momentum in heavy-ion collisions and a subsequent hadronization by the process of recombination.

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